A large operator symbol representing the intersection of multiple sets or mathematical collections in set theory.
Examples
Intersection of multiple sets
\bigcap_{i=1}^n A_i = A_1 \cap A_2 \cap \cdots \cap A_n
Intersection of infinite sequence of sets
\bigcap_{n=1}^{\infty} (0,\frac{1}{n}) = \emptyset
Intersection of indexed family of sets
\bigcap_{\alpha \in I} X_\alpha = \{x : x \in X_\alpha \text{ for all } \alpha \in I\}